Air-guiding means in the intake conduit of an internal combustion engine



July 31, 1956 Filed June 11, 1952 LLE AIR-GUIDING MEAN S IN THE INTAKE CONDUIT OF AN INTERNAL COMBUSTION ENGINE 3 Sheets-Sheet l July 31, 1956 R. WILLE 2,756,731

AIR-GUIDING MEANS IN THE INTAKE CONDUIT OF AN INTERNAL COMBUSTION ENGINE Filed June 11, 1952 3 Sheets-Sheet 2 July 31, 1956 R. WILLE 2,756,731

AIR-GUIDING MEANS IN T INTAKE CONDUIT OF AN INTERNAL COM TION ENGINE Filed June 11, 1952 3 Sheets-Sheet 3 fad /f MW: 4 mm WM United States Patent AIR-GUIDING MEANS IN THE INTAKE CONDUIT OF AN INTERNAL COMBUSTION ENGINE Rudolf Wille, Berlin-Schoneberg, Germany Application June 11, 1952, Serial No. 292,788

Claims priority, application Germany June 13, 1951 8 Claims. (Cl. 123-65) My invention relates to the cylinder body of an internal combustion engine and, more particularly, to the provision and attachment of air-guiding means in the intake conduit for the scavenging medium of a two-cycle engine, such guiding means being in form of an air foil positioned close to the cylinder bore and serving the purpose of so directing the air stream into the cylinder as to minimize undesirable turbulence.

It is. an object of the present invention to provide improved means of attachment of the air foil facilitating the assembly thereof at the same time minimizing the resistance ofliered by such mounting means to the air flow. It is another object of my invention to provide improved means for mounting the air foil within the intake conduit of a casting, such mounting means lending themselves to easy assembly irrespective of irregularities of the inside surface of such conduit.

Other objects will appear from the description of various forms of the present invention which are illustrated in the accompanying drawings, it being understood that such description is intended to rather facilitate an understanding of the invention than to limit the scope thereof. The latter will appear from the appended claims. In the drawings:

Fig. 1 is a partial radial section of a cylinder block of a two-cycle internal combustion engine showing an intake conduit merging with the cylinder bore and equipped with an' air foil mounted by my improved novel means;

Fig. 2 is a sectional view of the matter shown in Fig. 1, the section being taken along the broken line 2-2 of Fig. 1;

Fig. 3 is a partial sectional view similar to that of Fig. 1 of a modification, the section being taken along line 3-3 of Fig. 4;

Fig. 4 is a sectional view of what is shown in Fig. 3, the section being taken along line 44 of Fig. 3;

Fig. 5 is a view similar to that of Fig. 1 of a third form of my invention;

Fig. 6 is a sectional view similar to that of Fig. 5 of another form of my invention slightly modified with respect to that of Fig. 5, the section being taken. along line 66 of Fig. 7;

Fig. 7 is the section taken along line 7-7 of Fig. 6;

Fig. 8 shows another form of my invention slightly modified with respect to that of Fig. 3;

Fig. 9 illustrates a modification of my invention by way of a sectional view taken along line 9-9 of Fig. 10, while such Fig. 10 is the section taken along line 1010 of Fig. 9;

Fig. 11 depicts a modification of the form of the invention shown in Figs. 9 and 10, the view being similar'to that of Fig. 9; Fig. 12 is a partial axial section through the scavenging air intake of the cylinder of a two-cycle engine equipped with an air-guiding blade or foil attached by means of an eye;

v and from the sidewalls 324 of the intake conduit.

" ice Fig. 13 is a plan view of such air foil provided with the eye;

Fig. 14 is a view similer to that of Fig. 12 of a form of the invention slightly modified with respect thereto;

Fig. 15 is a plan view of the airfoil and the associated mounting means shown in Fig. 14;

Fig. 16 is a view similar to that of Fig. 1 of a form of my invention in which the air foil is mounted within the air intake opening of a lining sleeve of the cylinder;

Fig. 17 is an elevation of the lining sleeve shown in Fig. 16 viewed from the left with respect thereto;

Fig. 18 is a view similar to that of Fig. 1 of a form of my invention slightly modified with respect thereto, and

Fig. 19 is an elevation of what is shown in Fig. 18 viewed from the right thereof.

In all of the forms of my invention shown in the drawings the air foil is mounted in the piston-controlled intake conduit through which the scavenging medium enters the cylinder being directed by the walls of the conduit radially at an acute angle to the axis of the cylinder, the medium being air or a combustible gaseous medium.

The air foil is formed by a curved blade, the longitudinal edges of which extend in parallel planes intersecting the cylinder axis at right angles. The blade directs the air or other medium passing above it upwardly towards the upper edge of the opening of the intake conduit whereby undesirable turbulence at that point will be counteracted.

Thus in Figs. 1 and 2 the intake conduit 20 of substantially rectangular cross section merges with the cylinder bore of a cylinder body 21, the walls of the conduit forming an integral casting with the body 21 in the present embodiment. The top wall 22 of the conduit 20 is upwardly inclined towards the cylinder bore to impart an upward slant to the stream of air or other scavenging medium. The air foil is formed by a rectangular blade 23 extending into close proximity of the side walls 24 of the conduit 20. The upper edge 25 of the air foil is spaced from the wall 22 a substantially smaller distance than the leading edge 26 whereby the portion of the air stream passing between the wall 22 and the air foil 23 will be given an upward slant towards the upper edge 27 of the opening. In order to minimize the resistance to the air flow, the blade 23 is curved in a manner well known in aerodynamics. The air foil is also curved in a transverse plane of the cylinder to conform to the curvature of the cylinder wall, as will appear from Figs. 4 and 7.

The object of the present invention is a provision of mounting means for the air foil 23 whereby the lattermay be readily mounted in place irrespective of anyirregularities in the dimensions and shape of the walls. 22 and 24, such irregularities being liable to occur par-- ticularly in castings.

According to the present invention, the air foil 23' is supported by at least one rib 28 which extends between the wall 22 and the air foil and is rigid with both being either firmly attached, e. g. welded, or suitably attached thereto. The rib 28 preferably extends parallel to the streamlines of the current flowing through the intake 20 into the cylinder bore 21. ,In the present embodiment the rib 28 is located in a radial plane of the cylinder body extending through the axis of the conduit and is welded to the wall 22. In the other embodiments the supporting rib or ribs are detachably connected to the wall of the intake conduit.

In the embodiment illustrated in Figs. 3 and 4 the air foil 323 assumes substantially the same position within the intake conduit 320 as the air foil 23 in Fig. 1. There are two ribs 328 integral with the air foil 323, such ribs extending parallel and suitably spaced from one another The ribs 328 are welded to or integral with a flanged connecting member 329 which is inserted in and seals an opening 330 which is provided in the wall 322 and has a size permitting the introduction therethrough of the air foil 323 and the ribs 328. The connecting member 329 is held in place by four threaded bolts not shown which engage holes 331. In this manner, the air foil may be easily put in place when the engine is assembled. The only faces requiring machining to ensure a proper fit is the seating face 332 on the outside of the wall 322 and the inside of the flange of the connecting member In the embodiment shown in Fig. corresponding elements are designated by reference numerals similar to those of Figs. 3 and 4 ditfering therefrom by their first digit only. The wall 522 in this embodiment extends at right angles to the cylinder axis. Near the cylinder bore the inside of the wall 522 curves upwardly extending at an acute angle to the cylinder wall. The ribs 523 extend laterally from the connecting member 523 towards the cylinder bore.

The embodiment shown in Figs. 6 and 7 is similar to that of Fig. 5. However, each of the two ribs 628 supporting the air foil 623 is provided with a flanged plug 633 inserted from the inside into a bore 634 provided in the wall 622. Each of the two plugs is provided with a threaded bore and is held in position by a threaded bolt 635 inserted in the bore 634 from the outside and engaging the plug 633. The bolt 635 is sealed by a washed 637 against a machined bossv 636 provided on the wall 622.

The embodiment shown in Fig. 8 is similar to that just described differing therefrom mainly by the inclination of the wall 822 of the intake conduit d2tl and by the consequent shape of the ribs 823, whereas in the embodimcnt shown in Pi gs. 6 and '7 the wall 622 extends substantially horizontally except for a short zone merging into the cylinder wall. in Fig. 8, too, each of the ribs is formed with a flanged plug 833 having a threaded bore engaging with a threaded bolt 835 sealed against a boss 836. A washer 837 is interposed between the head of the bolt 835 and the boss 8355 to provide for a seal.

In the embodiment illustrated in Figs. 9 and 10 the air foil 923 is carried by two spaced parallel ribs 928 extending outwardly and upwardly, the end of each rib having an ear 933 engaging a vertical machined face 936 on the outside of the cylinder block and attached thereto by a threaded bolt 935.

The embodiment illustrated in Fig. 11 is similar to that shown in Figs. 9 and 10 except that each of the two ribs 1128 is downwardly inclined and curved downwardly being formed with an ear 1133 attached by suitable means not shown to a vertical machined face 1136 on the outside of the cylinder block. Whereas the face 936 in Fig. 9 is located above the intake conduit 920, the face 1136 is located beneath the intake conduit 1120.

In the two embodiments illustrated in Figs. 12, 13 and in Figs. 14, the single rib 1228, or 1428 respectively, of the air foil 1223, or 1423 respectively is formed with an eye 1233, or 1433 respectively, which is held in position by a bolt 1235, or 1435 respectively. In Fig. 12 the bolt is inserted in a vertical bore 1230 of a boss 1236 from the outside and its threaded shaft engages internal threads of the eye 1233 thus firmly holding the same against the inside or" wall 1222 with which the boss .1236 is formed. In the embodiment shown in Fig. 14, however, the bore 1439 is closed at its top and the bolt 1435 is inserted from below engaging internal threads of the bore 1430. In the embodiment shown in Figs. 14 and 15 I have formed the eye 1433 by bending the rib 1428 to a loop.

Figs. 16 and 17 illustrate my invention as applied to an internal combustion engine in which the cylinders are provided with lining sleeves 1639. The lining sleeve 1639 shown in Fig. 16 is provided with an opening 1640 which registers with the intake conduit 1620, the upper and lower walls of the opening 1640 being inclined as shown. In this embodiment the air foil 1623 extends within the opening 164%) and its single upwardly extending rib 1623 is attached to the sleeve 1639. In the embodiment shown the upper edge of the opening 1640 is provided with a slot 1641 and the end of the rib 1628 projects into the slot 1641 and is fixed therein, for instance welded in position. Owing to this arrangement, the sleeve 1639 may be equipped with the air foil prior to its introduction into the cylinder body.

The embodiment illustrated in Figs. 18 and 19 resembles that shown in Fig. 8 as far as the shape of the intake conduit 1820 and of the air foil 1823 is concerned. However, the supporting rib 1328 in this embodiment is integral with a bolt 1833 extending through a horizontal bore provided in a boss 1336 with which the wall 1822 is formed. The outer end of the bolt 1833 projects out of the boss 1836 and is threaded carrying a nut 1835 which engages machined vertical faces of boss 1836. The rib 1328 is wider than the diameter of the bolt 1833 and engages the inside of wall 1822. In this manner, the rib is firmly held in position when the nut 1835 is tightened.

From the foregoing description it will appear that my novel air-guiding means, which are preferably formed by a streamlined air foil, is provided with one or more supporting ribs which are profiled to conform to the streamlines of the air current and serve the purpose to firmly hold the air foil in place. As a result, the means supporting the air foil will produce a minimum of resistance to the flow of air or other gaseous medium. Moreover, the air foil may be reliably and accurately mounted in place irrespective of irregularities of the shape of the internal wall of the intake conduit for the scavenging medium.

While I have described my invention by reference to a number of embodiments thereof, I wish it to be clearly understood that my invention is in no way limited to the details of such embodiments, but is capable of numerous modifications within the scope of the appended claims.

What I claim. is:

1. In an internal combustion engine, the combination comprising a cylinder casting provided with an intake conduit having wall means for scavenging air, an air foil extending transversely through said conduit close to the point where said conduit merges into the cylinder bore of said casting, said air foil being shaped to converge toward said wall means, and at least one supporting rib freely exposed to the current of scavenging air extending between said wall means and said air foil, said wall means being provided with an opening and a connecting member inserted into said opening, said rib being rigid with said connecting member.

2. The combination according to claim 1 wherein said connecting member includes a flange which rests against said wall means on the outside thereof.

3. The combination according to claim 1 wherein said connecting member includes a flange which rests against said wall means on the inside thereof.

4. The combination according to claim 1 wherein said rib is the sole supporting means of said air foil, said rib and said air foil having a common plane of symmetry extending substantially through the. axis of said conduit centrally of said air foil.

5. In an internal combustion engine, the combination comprising a cylinder casting provided with an intake conduit having wall means for scavenging air, an air foil extending transversely through said conduit close to the point where said conduit merges into the cylinder bore of said casting, said air foil being shapedto converge toward said wall means, at least one supporting rib freely exposed to the current of scavenging air extending between said wall means and said air foil, said wall means being provided with an opening having a size permitting the introduction therethrough of said air foil and said rib, and a connecting member rigid with said rib and supporting said rib, said connecting member being mounted on said cylinder casting so as to close said opening.

6. In an internal combustion engine, the combination comprising a cylinder casting provided with an intake conduit having wall means for scavenging air merging into a cylinder bore, an air foil extending transversely through said conduit close to said cylinder bore, at least one supporting rib integral with said air foil and freely exposed to said scavenging air, a connecting member rigid with said rib and supporting the latter and means for mounting said connecting member on said Wall means, said wall means being provided with at least one bore, and said mounting means including at least one flanged member inserted in said bore from the inside and at least one threaded bolt to fix said flanged member in position.

7. In an internal combustion engine, the combination comprising a cylinder body provided with a cylinder bore and with an intake conduit having wall means for scavenging air merging with said cylinder bore, an air foil extending transversely through said conduit close to said cylinder bore, at least one supporting rib fixed to said air foil and formed with an eye mounted in contact with the inside of said wall means being provided with a bore registering with said eye, and means including a threaded bolt to firmly hold said eye in position on said wall.

8. In an internal combustion engine, the combination comprising a cylinder casing provided with an intake conduit having wall means for scavenging air, and air foil extending transversely through said conduit close to the point where said conduit merges into the cylinder bore of said casting, said air foil being shaped to converge toward said wall means, and at least one supporting rib freely exposed to the current of scavenging air extending between said wall means and said air foil, said wall means being provided with a bore, said rib being formed with a stud extending through said last mentioned bore and having a threaded end projecting out of said casting, and a nut screwed on said stud to hold said rib in place.

References Cited in the file of this patent UNITED STATES PATENTS 1,526,963 Chandler Feb. 17, 1925 2,051,351 Speed Aug. 18, 1936 2,126,860 Alfaro Aug. 16, 1938 2,244,453 Fottinger et al June 3, 1941 2,573,663 Hand Oct. 30, 1951 FOREIGN PATENTS 715,734 Germany Jan. 6, 1942 

